Leviton's Smart Mains Metering Accessory (LSMMA) provide an intuitive way to directly monitor the real-time energy consumption and production of energy sources (Grid/Solar/Battery/Generator) in your Leviton Load Center. Featuring a split-core design for easy installation, LSMMA CTs simply clip onto the conductors at the service mains or 2-Pole Circuit Breaker where the energy source is fed. The Whole Home Energy Monitor (LWHEM-2R) supports up to three pairs of LSMMA CTs to provide an aggregate view of the electrical system in the My Leviton app.